Centrifugal extractor.



O. G. BEACH.

CENTRIFUGAL EXTRACTOR.

APPLICATION rum) AUG. 21, 1912.

1,105,954; Pa tented Aug. 4,1914,

INVENTOR O. C. BFEc/f ATTORNEY;

UNITED STATES PATENT OFFICE.

OSCAR C. BEACH, OF LOSANGELES, CALIFORNIA, ASSIGNOR TO F. W. BRAUN, OFLOS ANGELES, CALIFORNIA.

CENTRIFUGAL EXTRACTOR.

Specification of Letters Patent.

Patented Aug. 4, 1914.

Application filed August 21, 1912. Serial No. 716,233.

To all whom it may concern Be it known that I, Osoan (l. BEACH, acitizen of the United States, and a resident of the city of Los Angeles,county of Los Angeles, and State of California, have invented certainnew and useful Improvements in Centrifugal Extractors, of which thefollowing is a specification.

tritugally driving a liquid solvent for part of the constituents throughthe material and conserving the separated soluble and insoluble parts.

Another object of the invention is to provide, a machine in which theaction of the solvent or the condition of the-material may be examinedwithout opening the containing receptacle.

Another object of the invention to provide a machine in which all of thesoluble constituent and the soluble constituent only is separated fromthe material.

The invention possesses other advantageous features, which, with theforegoing, will be set forth at length in the following description,where I shall outline in full that form of the invention which I haveselected for illustration in the accompanying drawings, in'which--Figure 1 is an elevation of the device, the pan receiver being shown insection to disclose the interior thereof. Fig. 2 is a verti cal sectionof the rotating or separating device.

The apparatus comprises a pan receiver 2 spun in one piece, the bottomof which is so inclined as to drain to the spout 3. The pan is mountedupon a suitable frame 4 and is provided with a removable cover 5 whichis provided at the center with an aperture which is closed by the smallcover (3.

Arranged below the part2 is a high speed electric motor 7 mounted on theframe 4 and arranged with its axis in the vertical position. Arranged onthe shaft 8 of the motor is a fly-wheel 9 which operates to balance therotating parts when an unbalanced load is placed in the separatingreceptacle. The

thercol. being provided with apertures separating receptacle 12 isconcave in shape with the sides thereof sloping upward, and is providedat the center of the/bottom with a hub 13 which fits over the motorshaft 8. The hub is provided with a slot 1 1- which engages the pin 15on the motor shaft thereby locking the two parts together for motion ina rotary direction. The hub of the fly-wheel 9 is provided at its upperend witha depression into which the hub 13 fits, thereby producing avery rigid structure.

The receptacle 12 is'provided with a flat circumferential flange 16,between which and the closing plate 17 is arranged an annular ring offiltering medium 18 such as filter or blotting paper. The externaldiameter of the filter ring 18 is equal to the external diameter of theflange 16 and its interior diameter is less than the interior diameterof the mouth of the receptacle, so that the, paper extends into thereceptacle for a considerable distance.

The closing plate 17 is formed of a transparent material such as plateglass, so that the condition of the material in the receptacle may beexamined without removing the cover plate. The cover plate is held inplace by the screw 11) engaging the hub 13 and bearing againstthe-collar 21 secured to the cover plate. The screw is formed hollow,the upper end thereof sloping outward forming a tunnel mouth and thelower end 22, to allow the solvent to be introduced without removing thecover plate. The filler screw is also provided with an air vent to allowthe displaced air to escape as the solvent is introduced. The ventconsists of a channel 23 extending along the side of the screw at thelower or straight portion thereof and passing through the upper orfunnel portion of the screw.

The device is particularly adapted to be used in the extraction ofbituminous aggregates to determine the percentages of bitumen andinsoluble material in any given material, although it is evident that itmay be used for other purposes. The aggregate is broken into smallparticles and is placed in the receptacle and the filter paper and coverplate securely attached, and a suitable amount of solvent, such ascarbon hisulfid,

is then rotated and the aggregate the receptacle between the filterpaper and the side wall of the receptacle and the solvent is forcedtheret-hrough, dissolving the soluble constituents and is forced throughthe filter paper into the pan receiver, from which it is drained. Byextending the filter paper into the receptacle the sand and other finerinsoluble material collects on the finished surface of the paper,thereby insuring filtration without penetration of any of the finer particles; If the filter paper extended only to the inner edge of thereceptacle, a portion of the finer particles would be forcedtherethrough, thereby causing a loss of the residue which it isdesirable to retain, as a loss in this direction renders the results ofthe test or analysis inaccurate. The projecting filter paper alsoprevents the sand from collecting upon the glass and rendering it opaque.

It generally requires several charges of the solvent to completelydissolve all of the soluble constituents, and after the first charge hasbeen driven off, the machine is stopped for the purpose of addinganother charge. The small cover 6 arranged in the coi'er 5 is providedso that access may be had to the filler screw for introducing a chargeof solvent without opening the entire pan 2, thereby reducing the lossof the solvent by evaporation. The side walls of the receptacle arecomparatively steep causing the material to slide or fall to the bottomwhen the rotation ceases. The condition of the material may then beobserved through the glass cover plate and the advisability of addingmore solvent determined. Perfect separation is' thereby rapidly obtainedby the use of a minimum amount of solvent, and on account of the smallsupplemental cover the loss of solvent due to evaporation or splashingis reduced to the minimum.

I claim:

1'. In a centrifugal extractor, the combination of a concave receptacleadapted to be rotated, a cover of transparent material closing the topof said receptacle and a filter-- ing medium arranged between andseparating the cover and the receptacle.

2. In a centrifugal extractor, the combination of a concave receptacleadapted to be rotated, a cover of transparent material closing the topof said receptacle, a filler screw adapted to clamp said cover inposition and ing the top of said receptacle, a screw en-.

gaging said hub adapted to clamp the cover in place, said screw beinghollow to permit the introduction of liquid into the closed receptacleand a filtering medium arranged between the cover and the receptacle.

4. In a centrifugal extractor, the combination of a rotatable concavereceptacle adapted to hold a quantity of material, a hub at the bottomof said receptacle, a plate closing the top of said receptacle, a screwengaging said hub adapted to clamp the cover in place, said screw havinga passage there- .in terminating at the upper end in a flaring opening,a second passage extending through said screw and a filtering mediumbetween the receptacleand cover.

5. In a centrifugal extractor, the combination of a receptacle adaptedto be rotated, a cover closing said receptacle, and. a ring of filteringmaterial arranged between the cover and the receptacle and extendinginto the receptacle.

6. In a centrifugal extractor the combination of a rotatable concavereceptacle pro: vided with a flat circumferential flange, a,

closing plate of substantially the vsame diameter as said flange, meansfor clamping the plate to the receptacle, and'an annular ring of filterpaper having the same external diameter as said flange and a widthgreater than said flange arranged between the flange and the closingplate.

7. In a centrifugal extractor, the combination of a receptacle adaptedto be rotated provided with a fiat circumferential flange,

a cover closing the top of said receptacle and adapted to be attachedthereto, and a ring of filteringmaterial arranged between said cover andsaid flange and extending into said receptacle in contact with saidcover.

In testimony whereof, I have hereunto set my hand at Los Angeles, Cal,this 12th day of August, 1912.

OSCAR G. BEACH.

In presence of- H..D. MACKINNON, WM. KENNEDY.

